What's black and white and red all over? A penguin with a sunburn.
What's black and white and read all over: a newspaper.
What's black, white, black, white, black, white, black, white, black, white, black, white? Penguin rolling down a hill.
What's black and white and dangerous? A nun with a machine gun/a penguin with a machine gun.
What's brown and sticky? A stick.
And there's my brothers favourite which I won't repeat without a cw because its vile (but kids will love it).